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Microchip Technology MCP3422A7-E/MC
- Part No.:
- MCP3422A7-E/MC
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP3422A7-E/MC.pdf
- Description:
- IC ADC 18BIT SIGMA-DELTA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,305
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Product details
Overview
MCP3422A7-E/MC from Microchip Technology is a 18-bit ΔΣ analog-to-digital converter with two differential input channels, on-board 2.048V ±0.05% voltage reference, programmable gain amplifier (x1/x2/x4/x8), and I²C interface supporting standard/fast/high-speed modes. It delivers 3.75 SPS at 18-bit resolution, consumes 135 µA typical in continuous mode (VDD = 3V), and operates across –40°C to +125°C - ideal for high-accuracy bridge and RTD sensing in industrial instrumentation.
For engineers reviewing the MCP3422A7-E/MC datasheet, MCP3422A7-E/MC pinout, MCP3422A7-E/MC application, or MCP3422A7-E/MC equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative parts with documented functional differences, and supply-chain support details specific to this SOIC-8 variant.
Technical Context
The MCP3422A7-E/MC implements a delta-sigma ADC architecture with integrated oscillator, self-calibrating offset/gain per conversion, and a switched-capacitor front-end sampling at 3.2 pF. Its differential input structure supports ±2.048V full-scale range (after PGA scaling) with 10 ppm INL and 1.5 µVRMS output noise at 3.75 SPS.
It uses a volatile configuration register to select resolution (12–18 bits), channel (CH1/CH2), PGA gain, and conversion mode (one-shot/continuous). Factory-programmed I²C address eliminates external address pins - unlike MCP3423/3424 - and enables direct drop-in use in space-constrained designs requiring dual-channel precision acquisition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit max (3.75 SPS); 12-bit (240 SPS) - enables trade-off between noise floor and throughput without hardware change |
| Differential Input Range | ±2.048V / PGA - supports direct connection to low-level sensors (e.g., 350 Ω strain gauge at x8 gain) |
| INL Error | 10 ppm of FSR - ensures ≤0.00039% linearity error over full scale, critical for calibration-grade measurements |
| On-board Reference | 2.048V ±0.05%, 15 ppm/°C drift - eliminates external reference component and layout sensitivity |
| Supply Current | 135 µA typical (3V, continuous); 36 µA typical (3V, one-shot @1 SPS) - extends battery life in portable fuel gauges |
| I²C Interface | Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) - compatible with legacy and high-throughput host controllers |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive and factory automation environments |
Pinout & Package
Package: 8-pin SOIC (Small Outline Integrated Circuit), JEDEC MS-012AC, body size 3.9 mm × 4.9 mm, 1.27 mm pitch. Exposed thermal pad (EP) internally connected to VSS and must be soldered to PCB ground plane for thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CH1+) | Differential analog input, channel 1 positive | Accepts signal up to VDD+0.3V; used with CH1– for true differential measurement or with VSS for single-ended |
| 2 (CH1–) | Differential analog input, channel 1 negative | Common-mode voltage must stay within VSS–0.3V to VDD+0.3V; forms matched pair with CH1+ for noise rejection |
| 3 (CH2+) | Differential analog input, channel 2 positive | Independent second channel; identical electrical specs to CH1+, enabling dual-sensor monitoring |
| 4 (CH2–) | Differential analog input, channel 2 negative | Matches CH2+; no crosstalk with CH1 path per datasheet characterization |
| 5 (VSS) | Analog/digital ground reference | Must connect to low-impedance analog ground plane; EP ties internally to VSS for thermal conduction |
| 6 (VDD) | Positive supply (2.7–5.5V) | Requires 0.1 µF ceramic + 10 µF tantalum bypassing; powers all analog and digital blocks |
| 7 (SDA) | I²C bidirectional data line | Open-drain output; requires external pull-up (5–10 kΩ); transmits conversion results and receives config commands |
| 8 (SCL) | I²C serial clock input | Open-drain input; clock edges control data timing; master-driven only; pull-up required |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibration per conversion | Eliminates need for system-level calibration routines; maintains accuracy across temperature and supply drift |
| Programmable gain amplifier (x1/x2/x4/x8) | Enables single device to handle mV-level thermocouple outputs and V-level bridge signals without external op-amps |
| On-chip 2.048V reference | Removes external reference IC and associated routing noise; 0.05% initial accuracy reduces BOM count |
| One-shot conversion mode | Reduces average current to ~36 µA at 1 SPS - suitable for wake-on-event sensor nodes |
| Differential input architecture | Rejects common-mode noise up to 110 dB (PGA=8), essential for noisy industrial plant environments |
Applications
| Temperature Sensing | Bridge-Based Pressure Sensing |
|---|---|
|
Use Scenario: Measuring resistance change in Pt100 RTD using constant-current excitation and ratiometric ADC reading. IC Role / Device Role / Timing Role: MCP3422A7-E/MC performs synchronized differential sampling of RTD voltage drop and reference resistor voltage to compute ratio, rejecting supply variation. Use Value: 18-bit resolution and 10 ppm INL enable <±0.1°C repeatability over –40°C to +125°C without software linearization. |
Use Scenario: Reading output of a 350 Ω Wheatstone bridge pressure transducer with 2 mV/V sensitivity. IC Role / Device Role / Timing Role: MCP3422A7-E/MC applies x8 PGA gain to amplify bridge differential output to full-scale range, then digitizes at 15 SPS for stable readings. Use Value: On-board reference and self-calibration eliminate drift-induced zero-shift errors common in uncalibrated bridge systems. |
| Weigh Scale Load Cell Interface | Battery Fuel Gauge Monitoring |
|
Use Scenario: Interfacing four-wire load cell in industrial platform scale with microcontroller-based controller. IC Role / Device Role / Timing Role: MCP3422A7-E/MC acquires CH1+/- and CH2+/- simultaneously (via sequential reads) to capture tare and active load signals. Use Value: Dual-channel capability allows internal tare subtraction in firmware, reducing need for external zero-adjust potentiometers. |
Use Scenario: Monitoring voltage and current sense signals in lithium-ion battery pack management system. IC Role / Device Role / Timing Role: MCP3422A7-E/MC samples cell voltage (CH1) and shunt voltage (CH2) at 60 SPS for Coulomb counting with 14-bit precision. Use Value: Low 135 µA operating current extends sleep-cycle duration in energy-conscious BMS firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 18-bit dual-channel ΔΣ ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS112C04IPWR (TI) | 4-channel, built-in sensor bias, 2.5V ref, SPI-only interface, no factory-set I²C address | Requires PCB redesign for SPI routing and external bias circuitry; better for multi-sensor arrays | Select if needing >2 channels or integrated excitation current sources; not pin-compatible |
| MCP3421A7-E/SN (Microchip) | Single-channel, same SOIC-8 package, identical I²C address scheme and register map | Lacks CH2 inputs; suitable only where one sensor suffices and board space is constrained | Drop-in replacement when reducing channel count; shares same layout footprint and firmware register access |
Compared with ADS112C04IPWR and MCP3421A7-E/SN, the MCP3422A7-E/MC uniquely balances dual-channel capability, factory-configured I²C address, and SOIC-8 compatibility - making it optimal for retrofitting existing single-channel designs with minimal layout changes while retaining full I²C infrastructure.
Availability
MCP3422A7-E/MC is available at Aetrix Electronics and suitable for industrial instrumentation, battery management systems, and factory automation equipment requiring stable component supply, long-term lifecycle assurance, and guaranteed traceability.
Supply support for MCP3422A7-E/MC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology Inc. is a leading provider of microcontrollers, analog devices, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP342X series was designed specifically for high-accuracy, low-power sensor signal conditioning in harsh environments - emphasizing integrated references, self-calibration, and robust I²C communication for industrial and automotive applications.
FAQ
What is the factory-programmed I²C address of the MCP3422A7-E/MC?
The MCP3422A7-E/MC has its I²C address permanently programmed during manufacturing and does not use external Adr0/Adr1 pins. Its fixed 7-bit address is 1001000 (0x48) in standard notation, allowing immediate integration without address jumpers or configuration resistors - simplifying PCB layout and firmware initialization for the MCP3422A7-E/MC.
Does the MCP3422A7-E/MC support single-ended input configurations?
Yes, the MCP3422A7-E/MC supports single-ended operation by connecting CH1– or CH2– to VSS. The datasheet confirms this in Section 3.1 and Figure 6-4. While differential mode delivers best noise rejection, single-ended use retains full 18-bit resolution and self-calibration - making the MCP3422A7-E/MC flexible for legacy sensor interfaces where only one signal wire is available.
How does the self-calibration function impact conversion timing for the MCP3422A7-E/MC?
Self-calibration occurs automatically before each conversion and is included in the total data rate specification. For example, at 3.75 SPS, the full cycle - including offset/gain calibration and conversion - takes 267 ms. This ensures measurement integrity without requiring separate calibration commands, and the MCP3422A7-E/MC guarantees accuracy over temperature and supply variation without user intervention.
Can the MCP3422A7-E/MC operate from a 2.7V supply while maintaining full 18-bit performance?
Yes, the MCP3422A7-E/MC is fully specified from 2.7V to 5.5V. All key parameters - including 18-bit resolution, 10 ppm INL, and 2.048V reference accuracy - are guaranteed across this range per DS22088C-page 5. At 2.7V, supply current drops to 135 µA typical (continuous), confirming that the MCP3422A7-E/MC sustains full precision in battery-powered applications.
What is the purpose of the exposed thermal pad (EP) on the MCP3422A7-E/MC SOIC package?
The exposed thermal pad (EP) on the MCP3422A7-E/MC is internally connected to VSS and must be soldered to a PCB ground plane. It reduces thermal resistance (θJA = 149.5°C/W for SOIC), improves long-term stability by minimizing die temperature rise, and lowers analog ground noise - directly enhancing INL and offset drift performance. Leaving EP unconnected degrades both thermal and measurement integrity of the MCP3422A7-E/MC.
MCP3422A7-E/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 3.75
- Number of Inputs:
- 2
- Input Type:
- Differential
- Data Interface:
- I2C
- Configuration:
- MUX-PGA-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 8-DFN (2x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MCP3422A7-E/MC FAQ
1.How can I place an order for MCP3422A7-E/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3422A7-E/MC on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MCP3422A7-E/MC reliable?
The price and inventory of MCP3422A7-E/MC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP3422A7-E/MC is usually 5 days.
3.What payment methods are accepted for MCP3422A7-E/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3422A7-E/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3422A7-E/MC?
MCP3422A7-E/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3422A7-E/MC order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MCP3422A7-E/MC?
For technical support, including MCP3422A7-E/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3422A7-E/MC requirements.
6.How does Aetrix verify that MCP3422A7-E/MC is sourced from the original manufacturer or authorized distributors?
All MCP3422A7-E/MC products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MCP3422A7-E/MC meets industry standards.
7.What is the process for return or replacement of MCP3422A7-E/MC?
All MCP3422A7-E/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP3422A7-E/MC, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MCP3422A7-E/MC part is unused and in its original packaging.
Return procedure for MCP3422A7-E/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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